Yaoi manga where the guy doesn't get the guy you think he would?

Something like Unbalanced Heat, where the guy is being lead up to go for the guy that likes him and the story is basically based around them, but then he ends up going with someone else (the guy that was basically shown as the "bad" guy). I know that is a really bad description, but I hope you get what i mean. Just something that you wouldn't suspect to happen, when you have 2 possible love interests or something.